yaooqinn commented on a change in pull request #27110: [SPARK-30439][SQL]
Support NOT NULL in column data type
URL: https://github.com/apache/spark/pull/27110#discussion_r363571351
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
##########
@@ -160,7 +160,8 @@ statement
UNSET TBLPROPERTIES (IF EXISTS)? tablePropertyList
#unsetTableProperties
| ALTER TABLE table=multipartIdentifier
(ALTER | CHANGE) COLUMN? column=multipartIdentifier
- (TYPE dataType)? (COMMENT comment=STRING)? colPosition?
#alterTableColumn
+ (TYPE dataType (NOT NULL)?)?
Review comment:
this syntax seems not to be ANSI standard
the dedicated clauses might be
```sql
ALTER [ COLUMN ] column_name { SET | DROP } NOT NULL
```
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